Getting error Couldn't find User with 'id'=id - ruby-on-rails

Question

I am learning ruby on rails by making a project web app,
whenever i go to <%= link_to 'My Profile', user_path(:id) %> error Couldn't find User with 'id'=id" is shown...and url is "http://localhost:3000/users/id
If i convert above link to <%= link_to 'My Profile', user_path %>, it works but now all other pages except user's show page give error No route matches {:action=>"show", :controller=>"users"} missing required keys: [:id]....I cant seem to find any solution anywhere...
Here are my configs:
rake routes Prefix Verb URI Pattern Controller#Action
root GET / static#landing
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
user_confirmation POST /users/confirmation(.:format) devise/confirmations#create
new_user_confirmation GET /users/confirmation/new(.:format) devise/confirmations#new
GET /users/confirmation(.:format) devise/confirmations#show
user GET /users/:id(.:format) users#show
_header.html.erb
<%= link_to 'My Profile', user_path %>
users_controller.rb
class UsersController < ApplicationController
def show
#user = User.find(params[:id])
end
end
routes.rb
Rails.application.routes.draw do
root 'static#landing'
devise_for :users
resources :users, :only => [:show]

Answer 1

You need to pass the id of a user to user_path, not the symbol :id - so something like
<%= link_to 'My Profile', user_path(#current_user.id) %>
if the user you want to link to is in an instance variable - or since you are using Devise and it provides the current_user helper you might be wanting
<%= link_to 'My Profile', user_path(current_user.id) %>

Answer 2

I think the first thing wrong is this:
<%= link_to 'My Profile', user_path(:id) %>
You are using a symbol, not a variable
<%= link_to 'My Profile', user_path(#id) %>
Would have an actual variable, assuming you have set #id in your controller.
Normally however you would not set the id for a user in a path - it's a recipe for someone to just change the number manually and view someone elses.
Lets assume you set a session variable called :user_id, then you should do something adding a collection route - so no id is sent.
resources :users do
get :show_profile, on: :collection
end
This gets you a path to your show_profile action, called with
link_to 'My Profile', show_profile_user_path
Then in your controller do your user look up from the session - so something like:
#user = User.find_by id: session[:user_id]
I don't know how devises does things, but please don't trust a user to not fiddle with your parameters!